Answer
Trigonometric methods.
Work Step by Step
We use the trigonometric method since the integration is of the form
$$
\int \sin ^{n} x \cos ^{m} x d x
$$
and in this problem we have $n=m=3.$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 8 - Techniques of Integration - 8.6 Strategies for Integration - Exercises - Page 431: 3
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